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lehoangkhangxxl
2 năm trước
cho góc xOy và x'o'y' có ox song song o'x' ,oy song song o'y' chứng minh rằng a,nếu góc xOy và x'o'y'đều nhọn thì chúng bằng nhau b,nếu 1 trong 2 góc xOy hoặc x'o'y' có 1 góc nhọn góc còn lại tù
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